Abrasive sheet holding sanding disk



Aug. 30, i949. A. F. P|MENTEL 2,480,508

ABRASIVESHEET HOLDING SANDING DISK Filed April 14, 1947 Patented Aug. 30, 1949 kUNITED STATES PATENT OFFICE 11 Claims.

My invention relates to improvements in buffers, surface Sanders, polishers, and the like, with particular reference to such as are mechanically driven, and at high speeds, although not necessarily restricted thereto.

In the case of a high speed sander, for instance, the usually thin surface-engaging sanding disk or the like has been secured to the rotary head by clamp means including a laterally protruding portion. This makes the device dangerous to the hands of the operator when in use, and also the presence of these laterally extending clamp portions makes it impossible to closely approach walls or raised portions adjacent lthe surface being worked upon. Also, prior art devices of this class afford no protection for the upturned sides of the emery or other surfaceengaging sheet which is clamped to the head.

It is, therefore, the primary object of my invention to overcome the objections hereinabove noted, by the provision of novel and improved head-associated clamping means for a sand disk or other work-engaging surfacing, which means is free of laterally projecting protuberances so as to not only avoid likelihood of injury to the operator, but also to assure against the marring of adjacent raised surfaces; and, finally, to protect against wearing or tearing of the sides of the disk at and adjacent the point of attachment to the head when the device is in use.

Also, the invention provides a securing means for a replaceable work engaging head-surfacing f which enables said surfacing to be readily applied or removed from the head with a minimum of time expenditure, and without the exercise of any particular skill.

Another object of the invention is to furnish la device as characterized having a novel head including a removable backing element for a sand A disk or thelike, said disk-backing element pre- Y senting a plane surface at one face for use when vit is desired to sand a floor or other plane surface; and the opposite face of said removable head element providing a curved surface so as to facilitate polishing or sanding variously curved objects, such as bowls, chair rockers, and the like.

Additionally, the invention contemplates a buffer or the like which involves a minimum number of very simple parts, which are strong, and

' durable, and inexpensive to manufacture, in that they may be readily fabricated in quantity in a number of ways from a wide variety of products, such as wood, plastic, or metal. This latter matter of material that may be used is of particular moment when lightness in weight is a factor, as is frequently the case.

The foregoing and other objects of the invention will be readily understood and appreciated by those skilled in the art upon reference to the accompanying drawing in connection with the detailed description of the now preferred embodiment of the invention appearing hereinafter.

Although one example of the invention has been illustrated in accordance with the requirements of the Patent Statutes, it will be understood that my inventive concept is susceptible of other mechanical expressions Within the spirit and scope of the subject matter claimed hereinafter.

In the drawing, wherein the same reference characters have been used to designate the same parts throughout the several views,

y Fig. 1 is a side elevational View of a buffer, sander, or the like, embodying my invention, the same being illustrated as carried by a conventional drive shaft-carried chuck;

Fig. 2 is a bottom elevational view of the device illustrated in Fig. 1;

Fig. 3 is a top plan view;

Fig. 4 is a cross-sectional view taken on the line 4-4 of Fig. 2 showing the plane surface of the removable head element presented toward the work; and

Fig. 5 is a cross-sectional view similar to Fig. 4, but showing the removable head-carried element reversed, as when a curved surface is to be worked upon.

Referring to the drawing by reference characters, numeral 6 designates a bowl-like head element havin-g the marginal flange 6a which is circular, and surrounds the circular concaved recess l. This recess 'l is adapted to at least partially receive the removable block-like disk 8 which constitutes the carrier or backing for the sand disk or other polishing surfacing 9.

In Fig. 4, the sand disk 9 is disposed upon the felt or other slightly compressible disk Il] against the plane surface 8a of the head disk 8 as when a plane surface is to be worked upon. However, in Fig. 5 the head disk 8 is shown reversed, so as to present curved surface 8b to the sand disk or the like 9. In this latter instance, a concavoconvex compressible disk Illa is disposed between sand disk 9 and the convexly curved surface 8b of head disk 8.

Figs. 2 and 4 best illustrate that the sanding or other disk 9 has laterally spaced segmental edge cut-outs so that a series of intermediate tongues 9a will be provided to be reverted rearwardly in edge to edge relationship about the edge of head disk 8. These tongues 9a, are clamped against the rear surface of head disk 8 by means of the concave marginal portion of the bowl member 6 in a manner to be now described.

In carryingg outltheinventiongx'provide the removable'head disk'- 8 and the bowlA element 6 of the head with aligned concentric tapped holes i I,

13a, for reception of a clamp screw or bolt, I2?` When this screw or bolt {Zvisrtightened-umit .will be obvious that the head disk 8 will be drawn tightly into the recess 'I ci thel bowlfelement 5(A of the head, thus clamping `thereverted .tongue portions 9a of the sanding disk @between the head disk 8 and said bowl member 6.

Reference to Figs. 4-and 5 indicates that the circurrnerential` flange, 6d ofv the bowl member Geoff-the head-overlies the .side off thefremova-ble head disk.8,sof as to-f protect an adjacent elevated surface ,from the-action ofthe .sand or other disk 8. Also; said head ,'.bowlflange dprotects-the sand disk 9 itself, and especiallyithetonguepor- Vtionsfilw thereof from-a cutting or 'ripping action,

as finfthefcase of the devicefbeing ,brought'too close: to- Ya isharp, metal :surface-.1

The-fisecuringi bolt i2 hasfthe hexagonally or: otherfrecessedrhead.- I2af f or.` the receptiorriof.' a

correspondingly,ormed'iwrench element designed to loosen or tighten saidbolt when `the'sand disk, polisher or :the Vlike-9,: is to beremovedor installed.

The tapped hole i3d of thevbowl elementazof i110 the: head-f extends `:out through' thee integraly and concentric tubular shank i 3 which: `is :received in thenchuclnas indicated inl Figi:

parte', namelyythe driven headcbowl elernent;thefi removableeblcckelike backing disk'S for :the-'sandinging polishingesuracingi Scand theiclampiscrew i2 for holding the afo-rementionedfeparts:assembiedzi "ili'escompressible-. backing.: disk id rinterposed; betweenx the removable 2 head?l 8i and:Y the sanding.fdi'skf is a: very usefultandndvantageous adjunct to the parts just mentioned;landesinceiit takes. up :shock in use of the: tool, it willi substantiallyiextend the` life off .the sandingzor polishing sui-facet element 19;

Wherrfthe curvedsurface.. 8b ot member fris disposed toward: thework, as in' Fig; 5; the plane compressible .disk iii vmay'ice housed inzthe rrecess '.1eof;Jincember1;l vasindicated.` And the same-is plane surface 8a is' disposed towardthe work as v in'F-ig. fi;

It is lalso. importanttoY note thatheadV :recess i 7 being. concavechj provides an: end-less" inwardly bevelledx :clamping surface v:toi efficiently-'compress f; 75+-sidefedgeszof-ithex:blockelike jelementp.-andcone'iof.

4 and hold the sand disk tabs 9a against the block edge (Figs. 4 and 5) regardless which block face (8a or 8b) is directed toward said recess 'I'.

The essential parts of the device may obviously be made out of wood, metal, or plastic, and may be molded, stamped, or turned, depending upon the materials used, thus rendering the device very inexpensive to make, and very light in weight if desired.

Having thus described my invention, What I claim is:

l. A device of the class described comprising in combination, a manipulatable head having a recess in one face, a marginal skirt surrounding ,saidi recess, ai block-likes element shaped to conform to saidrecess and'iofa sizeto snugly t in same, said block-like element being of a widthwise size in all directions less than the correrecess and providingan outwardly disposed backlike element being partially projectable into said recess and providing an outwardly disposed backingsurface for a work engaging surfacing, la replaceable work engaging sheet dimensioned oversizelwithrespect to said block-like element at least at points approximately opposite one another: andfw-herebyvsaid opposed portions will overlier opposite edges ofsthe block-like element,

Y andzone4 ofv said Askirt and block-likeelement havingaanv inwardlybevelled surface. engaging the other whereby to clamp Athe-.block-edge.overlap-- ping-y. portions of said- .sheettherebetween. ,said skirt'l terminating short ofithe planes of-` sheetbacking surface Vof 'said' rblock-like element. and protecting-the marginalportions of said block-like element and sheet', and. means operatively .engageablef-withzthehead and.:blockflike element for 2: A- device for; the classfdescribed comprising inn.'combination-y a `manipulatable=.head having a recess fin one face; a1 marginal-.skirt surrounding said: recess; a vblock-like velement 4partiallyjprojectable vinto. said :recess and ,providing opposite head-recessr-re'ceivingfacess differently, profiled andf selectivelyf availableas aibackingrfor awork- :engaging surfacing," a replaceable :work-engagings sheet. dimensionedv oversizef wit-h' respect to said",block-'lilacy elementat least at .points-approxi-mately oppositeionevanother and :whereby saidfopposedffportions willi overliezopposite edges "of: thex'block-like element, and vone of isaidskirt and fblockslike; element having an inwardy fbevelledsurface .engaging ,the other `Wl-ierebygto clamp thefiblock-'edge overlappingyportions:lof said sheet therebetween,;saidfskirt terminating short o1 the plane of sheet-backingfsurface Vof saidjolock-like element. and@A protecting the: marginal portions of said-',blookl-'like-r element and' sheet; and' means Aoperativelyengageable witlrltheeheadz and blocklike,Y element for :drawing the; two together;

3;1.Adevice'.of fthe .class described .comprisingfin combination, a manipulatable.headhavingrA a .recesszinron'e face; azmarginal skirt@ surrounding said recess, .a A:biockr-.like :element shapedltoz confornr tosssaidLrecessan'd. of 'a1 :sizeI to snuglyt Ain same," said` biocke'likelelement being Lof! aiwidthwise sizein=all.directions1less' than thef correspendingT exterionrsizei :of 2 saidfhead, vsaid Jblocklike-'relementf'being :partiallyproj ectable finto.' said recess :and providing an'outwardly disposedhackingsurace for azworksengagingsurfacinggia -replaceable iworkeengaging; sheet dimensioned: oversize'witlr respect to saidfblock-lik'e element 'atleast at :points-approximatelyopposite one another and wherebysaid .opposed portions f will overliepposaid skirt and block-like element having an inwardly bevelled surface engaging the other whereby to clamp the block-edge overlapping portions of said sheet therebetween, said skirt terminating short of the plane of sheet-backing surface of said block-like element, and protecting the mai'- ginal portions of said block-like element and sheet, a compressible pad interposed between said sheet and its block-element-provided backing surface, and means operatively engageable with the head and block-like element for drawing the two together.

4. A device of the class described comprising in combination, a manipulatable head having a recess in one face, a marginal skirt surrounding said recess, a block-like element partially projectable into said recess and providing opposite head-recess-receiving faces diierently profiled and selectively available as a backing for a workengaging surfacing, a replaceable work-engaging sheet dimensioned oversize with respect to said block-like element at least at points approximately opposite one another and whereby said opposed portions will overlie opposite edges of the blocklike element, and one of said skirt and block-like element having an inwardly bevelled surface engaging the other whereby to clamp the block-edge overlapping portions of said sheet therebetween, said skirt terminating short of the plane of sheetbacking surface of said block-like element, and protecting the marginal portions of said blocklike element and sheet, a compressible pad interposed between said sheet and its block-elementprovided backing surface, and means operatively engageable with the head and block-like element for drawing the two together.

5. A device of the class described comprising in combination, a rotatably driven disk-form head having a recess in one face, a circular marginal skirt surrounding said recess, a block-like disk element shaped to conform to said recess and of a size to snugly fit in same, said block-like element being of a widthwise size in all directions less than the corresponding exterior size of said head, said block-like element being partially projectable into said recess and providing an outwardly disposed backing surface for a work-engaging surface, a replaceable disk-form work-engaging sheet dimensioned oversize with respect to said block-like element whereby to overlie the edges of the block-like element, land one of said skirt and block-like element having an inwardy bevelled surface engaging the other whereby to clamp the block-edge overlapping portions of said sheet therebetween, said skirt terminating short of the plane of sheet-backing surface of said block-like element, and protecting the marginal portions of said block-like element and sheet, and means operatively engageable with the head and blocklike element for drawing the two together.

6. A device of the class described comprising in combination, a rotatably driven disk-form head having a recess in one face, a circular marginal skirt surrounding said recess, a block-like disk element shaped to conform to said recess and of a size to snugly t in same, said block-like element being of a widthwise size in al1 directions less than the corresponding exterior size of said head, said block-like element being partially projectable into said recess and providing an outwardly disposed backing surface for la work-engaging surfacing, a replaceable disk-form work-engaging sheet dimensioned oversize with respect to said block-like element whereby to overlie the edges of the block-like element, and one of said skirt and block-like element having an inwardly bevelled surface engaging the other whereby to clamp the block-edge overlapping portions of said sheet therebetween, said skirt terminating short of the plane of sheet-backing surface of said block-like element, and protecting the marginal portions of said block-like element and sheet, and bolt means operatively engageable with the head and blocklike element for drawing the two together,.

7. A device of the class described comprising in combination, a rotatably driven disk-form head having a recess in one face, a circular marginal skirt surrounding said recess, a block-like disk element partially projectable into said recess and providing opposite head-recess-received faces differently profiled and selectively available as a backing for a work-engaging surfacing, a replaceable disk-form work-engaging sheet dimensioned oversize with respect to said block-like element whereby to overlie the edges of the block-like element, and one of said skirt and block-like element having an inwardly bevelled surface engaging the other whereby to clamp the block-edge overlapping portions of said sheet therebetween, said skirt terminating short of the plane of sheetbacking surface of said block-like element, and protecting the marginal portions of said blocklike element and sheet, and means operatively engageable with the head and block-like element for drawing the two together.

8. The combination set forth in claim 4, and a compressible pad for each of said sheet-backing surfaces of the block-like element, and said head recess adapted to house at least one of said pads when it is not in use.

9. The combination set forth in claim 1, and a concentric attaching post extending from the face of said head member opposite its recessed face.

10. The combination set forth in claim 6, said head element having a chuck-engaging post con- ;centrically projecting from the face opposite its recessed face, and said bolt means working in said post.

11. The combination set forth in claim 1, land said means for drawing the block and head together comprising a single bolt, said block having a tapped hole in which said bolt takes, a sleeve carried by the back of said head and receiving said bolt, and the outer end of said bolt terminating in a shoulder engaging the outer end of said sleeve whereby the latter provides a thrust bearing for said bolt.

ARTHUR F. PIMENTEL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 250,003 Rogers Nov. 22, 1881 407,246 Rogers July 16, 1889 656,283 Edwards Aug. 21, 1900 1,054,006 Lentz Feb. 25, 1913 FOREIGN PATENTS Number Country Date 8,387 Great Britain 1894 63,854 Switzerland Mar. 12, 1913 249,656 Great Britain Apr. 7, 1926 

